fix(cjs)!: remove .default suffix from d.ts and d.cts files

[userquin]

This PR will revert changes in .cjs files, patching d.ts and d.cts instead.

I need to check a few packages, rn next example working with these changes (postcss).

(Maybe we can patch only postcss packages, there is no way yet to configure postcss plugin in Next and Webpack (?) with .default suffix: unocss/postcss and @unocss/postcss)

The dist-verify.ts script is wrong (in this PR)...

/cc @kwaa

We also have some problems when using old ESLint: check #3751

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[antfu]

Instead of increasing the complexity of patching, maybe we could expose some "proxy cjs file" doing something like

const mod = require('./dist/index.cjs')

module.exports = mod.default
// this line might not be needed if no named exports (eslint/postcss plugin for example)
Object.assign(module.exports, mod)

[userquin]

I still need to review dist-verify script...